1F–288 ENGINE CONTROLS
DAEWOO M-150 BL2
LACK OF POWER, SLUGGISHNESS, OR SPONGINESS
Definition: The engine delivers less than expected pow-
er. There is little or no increase in speed when the accel-
erator pedal is partially applied.
Step Action Value(s) Yes No
1
Were the Important Preliminary Checks performed?
–
Go to Step 2
Go to
“Important
Preliminary
Checks”
2
1. Verify the customer’s complaint.
2. Compare the performance of the customer’s
vehicle with a similar unit.
Does the problem exist?
–
Go to Step 3 System OK
3
1. Inspect the air filter for excessive contamination.
2. Replace the air filter as needed.
3. Check the transaxle shift pattern and down shift
operation.
Does the transaxle operate properly?
–
Go to Step 4 Go to Step 5
4
Check the fuel system pressure.
Is the fuel system pressure within specifications?
380 kPa
(55 psi) Go to Step 7 Go to Step 6
5
Repair the transaxle as needed.
Is the repair complete?
–
System OK
–
6
Repair the fuel system as needed.
Is the repair complete?
–
System OK
–
7
Check for a restricted fuel filter or contaminated fuel.
Is the problem found?
–
Go to Step 8 Go to Step 9
8
Repair or replace any components as needed.
Is the repair complete?
–
System OK
–
9
1. Check the ignition system output for all of the
cylinders using a spark tester.
2. Check for proper ignition control operation.
Is the ignition system operating properly?
–
Go to Step 10 Go to Step 11
10
1. With the engine at normal operating temperature,
connect a vacuum gauge to a vacuum port on the
intake manifold.
2. Operate the engine at 1000 rpm.
3. Record the vacuum reading.
4. Increase the engine speed to 2500 rpm.
5. Note the vacuum reading at a steady 2500 rpm.
Does the vacuum decrease more than the value
specified?
10 kPa
(3 in Hg) Go to Step 12 Go to Step 15
11
Repair or replace any ignition system components
as needed.
Is the repair complete?
–
System OK
–
12
Inspect the exhaust system for restrictions and
damaged or collapsed pipes.
Is the problem found?
–
Go to Step 13 Go to Step 14
13
Repair or replace any components as needed.
Is the repair complete?
–
System OK
–
14
1. Check the cylinder compression and valve timing.
2. Inspect the camshaft for excessive wear.
Is the problem found?
–
Go to Step 15 Go to Step 16
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